Inventor General Discussion

Inventor General Discussion

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Active Member
kenbig
Posts: 8
Registered: ‎01-21-2013
Message 1 of 5 (807 Views)

Sheetmetal contour roll flat pattern

807 Views, 4 Replies
01-21-2013 05:25 AM

Inventor 2013-I'm working on a sheet metal cover using contour roll and I find when I dimension the flat pattern that radii that should be the same are not. Can someone tell me if my approach is fundamentally flawed? I  tried making this part out of one 220 degree contour roll and I found when dimensioning that the center points of the arcs are not symmetric as expected. I then used two contour rolls to create the part basing the second contour roll on the first contour roll sketches and I still have the same issues. Any thoughts would be appreciated. Thanks

*Expert Elite*
blair
Posts: 4,334
Registered: ‎11-13-2006
Message 2 of 5 (766 Views)

Re: Sheetmetal contour roll flat pattern

01-21-2013 08:41 AM in reply to: kenbig

You most likely need to read up on Bend Allowance Factor. This will vary according to the type of bending procedure used. The Flat-Layout length is determined by the neutral axis through the material. Not quite the center line of the product.

 

The attached spread sheet might help you out.

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Mentor
TheCADWhisperer
Posts: 247
Registered: ‎04-16-2010
Message 3 of 5 (754 Views)

Re: Sheetmetal contour roll flat pattern

01-21-2013 09:15 AM in reply to: kenbig

Check this example.

Active Member
kenbig
Posts: 8
Registered: ‎01-21-2013
Message 4 of 5 (747 Views)

Re: Sheetmetal contour roll flat pattern

01-21-2013 09:28 AM in reply to: kenbig

thank you for you quick reply, I took a look at the spread sheet and  it looks like I have a lot to understand in order to properly apply all possible variables to my project. In the mean time while I try to figure this all out and understand the spread sheet, does it make sense that these variables create the problems in symmetry that I see in the flat pattern dimensions?

Active Member
kenbig
Posts: 8
Registered: ‎01-21-2013
Message 5 of 5 (744 Views)

Re: Sheetmetal contour roll flat pattern

01-21-2013 09:33 AM in reply to: TheCADWhisperer

thank you for you quick reply and example, your solution sure is elegant compared to my attempt. now I have to go back and see if it fits my mating part and if I can create the remaining parts to the cover in a similar fashion, thanks again.

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